Water Pump Impeller Kit – Fits Yamaha F75-F100 Outboard Motors (Replaces 61A-W0078-A3-00)

Water Pump Impeller Kit – Fits Yamaha F75-F100 Outboard Motors (Replaces 61A-W0078-A3-00)

This water pump impeller service kit is designed for Yamaha F75, F80, F90, and F100 4-Stroke outboard engines manufactured between 1999 and 2013. Please refer to the detailed model list below to ensure an exact match for your engine.

This kit serves as a direct replacement for Yamaha OEM part numbers 61A-W0078-A3-00, 61A-W0078-A2-00, and 61A-W0078-A4-00, as well as aftermarket parts from Sierra (18-3396-1) and Mallory (9-48618).

• Includes all necessary components for a complete water pump rebuild, including the housing, impeller, gaskets, and hardware.
• Engineered for a direct bolt-on assembly, matching OEM fit and function.
• The impeller is constructed from high-quality, durable neoprene marine rubber for reliable performance.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Cartridge Insert (61A-44322-02-00)
• 1 x O-Ring (93210-86M38-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x Impeller (6E5-44352-01-00)
• 1 x Cartridge Outer Plate (6G5-44323-01-00)
• 1 x Water Pump Gasket (6E5-44315-A0-00)
• 2 x Dowel Pins (93606-12019-00)
• 4 x Bolts, With Washer (90119-08M14-00)
• 1 x Woodruff Key (90280-04M05-00)

Installation Guide

1. Disconnect the negative battery cable and remove the engine cover for safety.
2. Place the outboard in neutral and remove the bolts securing the lower unit (gearcase) to the upper casing, then carefully lower it.
3. Unbolt and remove the old water pump housing to expose the impeller and wear plate.
4. Note the orientation of the old parts, then remove the impeller, Woodruff key, wear plate, and gaskets.
5. Thoroughly clean all mating surfaces, ensuring they are free of old gasket material, salt deposits, or corrosion.
6. Install the new dowel pins and Woodruff key onto the driveshaft.
7. Place the new gasket and cartridge outer plate onto the lower unit.
8. Slide the new impeller onto the driveshaft, turning the shaft clockwise to correctly seat the impeller vanes inside the housing.
9. Install the new cartridge insert and O-rings, ensuring they are properly seated.
10. Secure the new pump housing with the provided bolts, tightening them evenly to the manufacturer's specified torque.
11. Reinstall the lower unit onto the outboard, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
12. Once assembled, start the engine using a water supply (flushing muffs) and confirm a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: First, check your engine's model and year against the "Compatible Engine Models" table. This kit fits a specific range of Yamaha F75, F80, F90, and F100 models. For further verification, we recommend using the linked Yamaha Serial Number Guide to identify your exact engine details.

Q: What are the common signs of a failing water pump impeller?
A: Key indicators include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "tell-tale" outlet port, or a high-pitched whining sound from the lower unit. During a visual inspection, you may also see cracked, brittle, or missing vanes on the old impeller.

Q: How often should I replace the water pump impeller?
A: For preventative maintenance and to ensure engine reliability, it is best practice to inspect the impeller annually and replace it every 1-2 years or 100-200 hours of use. Replacement intervals should be shorter if the engine is operated frequently in saltwater or sandy/silty conditions.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.